Improvement in machines for grinding harvester-knives



3 Sheets-#Smet 1.

l. M. CUNNEL.

M a c h i n e s fo r G r i n d i n g H a rv este r- K n i v e s.

Patented my 15, 1873` ternel/s.

.3 Shees--Sheet 2.

1.M. GUNNEL. Machines` for Grinding Harvester-Knives.

Patented July 15, 1873.

3 Sheets--Sheet v i. M. CUNNEL. f Machines for Grinding Harvester-Knives. N0.Y\1f(),8lll Patentediu|yi5,i873.

Witness Attorneys.

AM PffoTMH'I/UGHAPHIC Ca Nfwsonw Hennes; f

UNITED STATES PATENT OFFICE.,

JAMES M. OONNEL, OF NEWARK, OHIO.

IMPROVEMENT IN MACHINES FOR GRINDING HARVESTER-KNIVES.

Specification forming part of Letters Patent No. 140,811, dated July 15, 1873; application led January 9, 1873.

OASE A.

To all whom it may concern:

Be it known that I, JAMES M. CONNEL, of Newark, in the county of Licking and in the State of Ohio, have invented certain new and useful Improvements in Machine for Grinding Harvester-Knives; and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereon making a part of this specification.

The nature of my invention consists in the construction and arrangement of a machine for grinding harvester-knives, as will be hereinafter more fully set forth.

In order to enable others skilled in the art to which my invention appertains to `make and use the same, I will now proceed to describe its construction and operation, referring to the annexed drawings, in which- Figure 1 is a side elevation of my entire machine; and Fig. 2 is an enlarged perspective view of a part of the same, both showing the means employed for grinding the beveled edges of the knives. Figs. 3 and 4 represent the emery-block for grinding the edges; and Fig. 5 is a perspective view, showing my machine when employed for grinding the back of the knives.

A represents a bench or platform, of any suitable dimensions, upon which is secured a standard, B. This standard is curved forward, as shown, so that its upper or front end is parallelwith the bench or platform A, and this end of the standard is slotted longitudinally 5 said slot a, therefore, being parallel with the platform. Through the slot @passes a bolt, b, on the outer end of which is a large cogged driving-wheel, O,provided with a suitable handle for turning the same. On the inner end of the bolt bis placed an arm, D, which arm and driving-wheel O can be moved to any point in the slot a of the standard and held by means of pins d d, inserted in holes in the standard, one pin on each side of the bolt b, there being a series of such holes in the standard to allow of the adjustment of the wheel and arm; the object of such adjustment being to place the grinding-tool in proper position to perform its work in the best possible manner. On the outer end of the arm D and on the outer side is a boss or projection, e, through which passes a shaft, f, and on the outer end of this shaft is a cog-wheel or pinion, E, that gears with the cogged drivingwheel C. On the inner end of the shaft fis formed a crank, upon which is placed a pi'tman, H, connecting the same with an emeryblock, G, for grinding the beveled edges of the knives. This block is made beveled on the under side from the center outward toward both sides, as shown in Figs. 2, 3, and 4. The under side of block is out with two series of diagonal serrations or channels, z' i, crossing each other, as shown in Fig. 4, and forming diamond-shaped figures h h over the entire under surface of the block. The channels or serrations i t' are so made that two adjoining sides of each figure h are vertical,

v`while the other two sides are beveled;l and hence when the machine is in operation, 'and the emery-block G in motion back and forth, it will cut both during its forward and backward movement. At the same time these channels or serrations allow the air to pass through to carry off all dust and keep the knives cool. The block G has a longitudinal groove or recess, 7c, in the center of the outer side, as shown in Fig. 3, which groove or recess extends down the ends of the block; and in the same is placed a metal band, I, at one end of which is a head, m, flttin g in the recess at one end of the block, and at the other end of the metal band is a flange, u, tting in the recess at the other end of the block. Through this flange n passes a set-screw, p, which thus clamps the block between it and the head m. To the head m the outer end of the pitman H is pivoted, so that by turning the drivingwheel G the emery-block G obtains the required reciprocating motion.

The knife to be ground is laid on a rest, J, having a groove for the reception of the knifebar, and a V-shaped recess at the proper point where the emery-block is to work so as to grind the adjoining edges of two contguous'knives,

the knife-bar being moved on said rest till all the knives have been operated upon.

K represents a rest under the boss e to support the arm D in proper position for causing the emery-block to work to the best advantage. For harvester-knives having smooth beveled edges this is all that is required; but such knives as have serrated edges require grinding on the back; and for that purpose I use the following` device, shown in Fig. 5: J is a rest placed lengthwise of the bench or platform A, and upon which the harvester-knife is placed with the bottom side up. In the back of the rest J is a groove for the reception of the back edges of the knives or knifebar, so that the same may be moved perfectly straight.

In place of the beveled emery-block G, I use a block, G', the under side of which is dat, and may be either smooth or serrated, as desired. This block is connected with the driving mechanism in the same lnanner as the former, and When in motion moves longitudinally along on the back of the knives. The block G should be as wide as the length of the longest knives, and then any sized knives may be ground with the same. In either case, whether the block G or G' is used, I employ a metal brace, L, to hold the block down to the Work. The rear end of this brace is attached to an arm or handle, M, extending from the side of the arm D, and the front end of the brace is slotted longitudinally, as shown. A screw, s, passes through this slot into the band I on the block, and by this means the block is held down to the Work, the brace, however, not interfering with the freedom of the reciprocating motion of the block.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-.

l. In combination With the driving-Wheel C, bolt b, and arm D, the slotted standard B having holes or perforations, as described, and the pins d d, substantially as and for the purposes herein set forth. y

2. A beveled emery-block, G, provided with diagonal channels or serrations t' 1'., in the manner herein described, so that the block will cut when moving in either direction, the dust carried off, and the knives kept cool, substantially as set forth.

3. In combination With an emery-block, G

i or G', the metal band I with head m, ange u, and set-screw p, constructed and arranged substantially as and for the purposes herein set forth.

4. The combination of the emery-block G or G', band I, pitnian H, crank-shaftf, pinion E, arm D, and Wheel C, all substantially as aud for the purposes herein set forth.

5. rlhe rest K, arranged as described, to support the arm D in proper position, for the purposes set forth.

6. The brace or guide L, arranged as described, one end being secured to the handle M 011 the arm D, and the other end slotted and connected by a screw, s, with a reciprocating emery-block, for the purposes herein set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 7th day of January, 1873.

J. M. CONNEL.

Witnesses:

A. N. MARR, EDM. F. BROWN. 

